Answer: The answer to this bummy  question is B
Step-by-step explanation:
 
        
                    
             
        
        
        
Looking at number 4, you first have to look at the information that you have:
On tuesday he practiced for 1 5/6 hrs
Monday he practiced for 7/10 hrs
He is supposed to practice for 1 1/4 hr.
You could write questions like:
How much more did Marco practice on Tuesday than he is supposed to practice?
This works because it does indeed involve subtraction, you would be subtracting the amount that he should have practiced from the amount of time that he did practice. 
If I didn't answer the question, please message me and I will clarify!
        
             
        
        
        
Hey there!
Since it's 30n, 30 is the coefficient and it's being multiplied by n.
We plug in n.
30(2) =
60
Hope this helps!
        
                    
             
        
        
        
Answer:
B
Step-by-step explanation:
I got it right
 
        
             
        
        
        
Answer:   <em>y = 3/4 x + 8</em>
Step-by-step explanation: First  you must find the slope of line k.
 <em>y2 - y1</em>
<em>m = -----------</em>        <em>The slope is 3/4</em>
<em>        </em><em>x2 - x1</em>
Since the two lines are paralell you know that line h has the same slope. 
Next you must find the y-intercept by replacing x and y with the values given by the point.
<em>y = 3/4x + ?  ----->  12 = 3/4(4) + ?</em>
<em>                               12 = 3 + 8</em>
The y-intercept is 8
Your equation for line h is <em> </em><em>y = 3/4 x +8 </em>
<em></em>
<em>Hope this was helpful!</em>